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Creating a hardlink to a file

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Operating Systems Solaris Creating a hardlink to a file
# 1  
Old 07-28-2008
Question Creating a hardlink to a file
I'm trying to relink a file someone tried to delete while a process (that we don't want to shutdown) also had a filehandle open to it.
Consequently, we've got an inode entry but no directory entry (aka 'file') for it.

I've tracked the inode number down via lsof, as well as the particular filehandle the process has within the /proc filesystem.

This filehandle is presented as a standard "file"/directory entry in /proc/<pid>/fd and I can read from it ok as I would any other file.

I was hoping to create a link to it back where it used to be but I keep getting a 'No such file or directory' error. I know I've got my ln syntax correct as I've tested it out on plain files elsewhere.
Code:
ln /proc/<pid>/fd/<handle> /path/to/application/logs/access

Is ln the tool to use here? Surely if I know the inode number, filehandle and what it used to be called, I can recreate it?
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LEARN ABOUT OPENSOLARIS

dir

dir_ufs(4)							   File Formats 							dir_ufs(4)

NAME

       dir_ufs, dir - format of ufs directories

SYNOPSIS

       #include <sys/param.h>

       #include <sys/types.h>

       #include <sys/fs/ufs_fsdir.h>

DESCRIPTION

       A  directory  consists of some number of blocks of DIRBLKSIZ bytes, where  DIRBLKSIZ is chosen such that it can be transferred to disk in a
       single atomic operation, for example, 512 bytes on most machines.

       Each  DIRBLKSIZ-byte block contains some number of directory entry structures, which are of variable length.  Each directory  entry  has  a
       struct  direct at the front of it, containing its inode number, the length of the entry, and the length of the name contained in the entry.
       These entries are followed by the name padded to a 4 byte boundary with null bytes.  All names are guaranteed null-terminated. The  maximum
       length of a name in a directory is  MAXNAMLEN.

	 #define DIRBLKSIZ			 DEV_BSIZE
	 #define MAXNAMLEN			 256
	 struct direct {
		 ulong_t  d_ino;		 /* inode number of entry */
		 ushort_t d_reclen;		 /* length of this record */
		 ushort_t d_namlen;		 /* length of string in d_name */
		 char	  d_name[MAXNAMLEN + 1]; /* maximum name length */
	 };

ATTRIBUTES

       See attributes(5) for a description of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Unstable			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       attributes(5), ufs(7FS)

SunOS 5.11							    16 Apr 2003 							dir_ufs(4)